Sales of new homes collapsed in May, sinking 33 percent to the lowest level on record as potential buyers stopped shopping for homes once they could no longer receive government tax credits.The bleak report from the Commerce Department is the first sign of how the end of federal tax credits could weigh on the nation's housing market.

The credits expired April 30. That's when a new-home buyer would have had to sign a contract to qualify.

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New-home sales in May fell from April to a seasonally adjusted annual sales pace of 300,000, the government said Wednesday. That was the slowest sales pace on records dating back to 1963. And it's the largest monthly drop on record. Sales have now sunk 78 percent from their peak in July 2005.

Analysts were startled by the depth of the sales drop.

"We all knew there would be a housing hangover from the expiration of the tax credit," wrote Mike Larson, real estate and interest rate analyst at Weiss Research. "But this decline takes your breath away."